If an app uses EF Core global query filters for tenant isolation, what extra guardrails would you add?

Add guardrails around EF Core tenant query filters

Explains how tenant query filters help, where they can be bypassed, and what extra safeguards protect tenant isolation.

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I would use the query filter as one guardrail, not the whole security model. The tenant id needs to come from trusted server-side context, not a client-supplied value. Entities that are tenant-owned need a tenant key, and queries need tests that prove users cannot see another tenant's rows. Raw SQL, background jobs, admin paths, and IgnoreQueryFilters need special review because they can bypass the normal filter.

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Tenant isolation, global query filters, bypass risk, raw SQL, background jobs, tests, database constraints, and auditing.

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Global query filters can apply tenant predicates consistently, but tenant isolation also depends on trusted tenant resolution, write validation, database constraints or policies, administrative bypass control, and tests for every access path.
I would use the query filter as one guardrail, not the whole security model. The tenant id needs to come from trusted server-side context, not a client-supplied value. Entities that are tenant-owned need a tenant key, and queries need tests that prove users cannot see another tenant's rows. Raw SQL, background jobs, admin paths, and IgnoreQueryFilters need special review because they can bypass the normal filter.
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I would add layered protections. Application authorization checks verify the user belongs to the tenant. Database indexes include tenant id for performance and scoped uniqueness. Foreign keys can include tenant-aware relationships where appropriate. Admin or support tools need explicit reasons and audit logs when crossing tenant boundaries. Query filters reduce accidental leaks, but code review and tests need to cover bypass paths.

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Trusting global query filters as the only tenant protection.
Reading tenant id directly from request input.
Forgetting raw SQL and background job bypass paths.
No integration tests with multiple tenants.

If an app uses EF Core global query filters for tenant isolation, what extra guardrails would you add?

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